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Fair Values of Assets and Liabilities - Carrying Amounts and Fair Values of Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2012
--- | --- | --- | ---
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Cash and due from banks | $ 53,991 | $ 98,724 |
Interest-bearing deposits | 1,780 | 4,258 |
Securities available for sale | 1,297,203 | 1,171,303 |
Other investments | 28,357 | 28,228 |
Loans | 4,218,810 | 4,204,704 | 4,128,588
Deposits | 4,711,578 | 4,557,881 |
Short-term borrowings | 308,100 | 356,227 |
Long-term debt | 174,318 | 174,471 |
Subordinated debt | 105,750 | 105,750 |
Level 1 [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Other investments | 0 | 0 |
Level 2 [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Other investments | 28,357 | 28,228 |
Level 3 [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Other investments | 0 | 0 |
Carrying Amount [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Cash and due from banks | 53,991 | 98,724 |
Interest-bearing deposits | 1,780 | 4,258 |
Securities available for sale | 1,297,203 | 1,171,303 |
Other investments | 28,357 | 28,228 |
Loans | 4,218,810 | 4,204,704 |
Deposits | 4,711,578 | 4,557,881 |
Short-term borrowings | 308,100 | 356,227 |
Long-term debt | 174,318 | 174,471 |
Subordinated debt | 105,750 | 105,750 |
Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Cash and due from banks | 53,991 | 98,724 |
Interest-bearing deposits | 1,780 | 4,258 |
Securities available for sale | 1,297,203 | 1,171,303 |
Other investments | 28,357 | 28,228 |
Loans | 4,291,687 | 4,245,114 |
Deposits | 4,645,967 | 4,493,764 |
Short-term borrowings | 308,092 | 356,221 |
Long-term debt | 176,295 | 176,178 |
Subordinated debt | 79,539 | 76,735 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 1 [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Cash and due from banks | 53,991 | 98,724 |
Interest-bearing deposits | 1,780 | 4,258 |
Securities available for sale | 513 | 555 |
Other investments | 0 | 0 |
Loans | 0 | 0 |
Deposits | 0 | 0 |
Short-term borrowings | 0 | 0 |
Long-term debt | 0 | 0 |
Subordinated debt | 0 | 0 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 2 [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Cash and due from banks | 0 | 0 |
Interest-bearing deposits | 0 | 0 |
Securities available for sale | 1,270,758 | 1,145,955 |
Other investments | 28,357 | 28,228 |
Loans | 57,636 | 82,949 |
Deposits | 4,645,967 | 4,493,764 |
Short-term borrowings | 308,092 | 356,221 |
Long-term debt | 176,295 | 176,178 |
Subordinated debt | 34,699 | 0 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 3 [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Cash and due from banks | 0 | 0 |
Interest-bearing deposits | 0 | 0 |
Securities available for sale | 25,932 | 24,793 |
Other investments | 0 | 0 |
Loans | 4,234,051 | 4,162,165 |
Deposits | 0 | 0 |
Short-term borrowings | 0 | 0 |
Long-term debt | 0 | 0 |
Subordinated debt | $ 44,840 | $ 76,735 |

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